Histology= the study of tissues
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1 Histology 2014
2 Histology= the study of tissues A tissue is a group of cells that have a similar shape and function. Different types of tissues can be found in different organs. In humans, there are four basic types of tissue.(there may be various sub-tissues within each of the primary tissues.)
3 And this type...
4 Epithelial Tissue(Epa- thee- lee- al) General Characteristics: - Found throughout the body; lining of organs and covers the outside of the body. (Ex. skin is epithelial tissue) - The major function of epithelial tissue includes protection, secretion, absorption, filtration and sensory reception. - Anchored to connective tissue (by a noncellular, nonliving basement membrane- collagen fibers and carbohydrate-glue) - Lacks blood vessels- (avascular) - Cells reproduce rapidly thru mitosis (rapid healing). - Cells tightly packed together
5 The ink of tattoos must be injected below the basement membrane.
6 It takes about 27 days for the outer layer of skin to shed and be replaced; that works out to 1.5 pounds of skin cells per year. Where does all the dead skin you shed go?
7 Epithelial tissue is classified by its shape and the number of layers. Helpful stuff: Name is based on its description squamous = flat cuboidal = square columnar = column (rectangle) simple = single layer stratified = multiple layers Pseudostratified- appears to be two or more cell layers but is not (pseudo = false)
8 Identify the tissues
9
10 Simple Squamous Function: diffusion (air sacs in lungs) and filtration (kidneys or walls of capilaries). (They are thin to allow rapid passage of substances through them.)
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12 Simple Cuboidal Function: Secretion and Absorption Found in kidneys, thyroid glands, and covering the ovaries
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14 Simple Columnar 1. Nonciliated simple columnar epithelial (with microvilli that increase surface area which then increase rate of absorption or they are goblet cells that secrete mucus) 2. Ciliated simple columnar epithelial (with cilia at top so to wave or sweep any trapped particles or mucus out of body) Function: Secretion and Absorption Found in upper respiratory tract, digestive tract, and uterus *Contains goblet cells to secrete mucus *Can have microvilli
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16 Stratified Squamous Multi layer squamous, functions in protection Found in skin and mouth
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18 Stratified cuboidal epithelium
19 Stratified cuboidal epithelium -rare -Found in ducts of adult sweat glands and esophageal glands and part of male urethra. Also found in mammary gland in breast and salivary glands in mouth. -Function- Protection and limited secretion and absorption
20 Pseudostratified Columnar -Nuclei are uneven which gives it a layered appearance but it s a single layer. (pseudo = false) -Can have goblet (form mucus) cells and cilia -Pseudostratified ciliated columnar epithelial cells learn to say that you ll impress a lot of people! ;) Location: lining air passages and tubes of the reproductive system
21
22 Transitional Epithelium -Changes from squamous to cuboidal -Stratified -Stretchable -Blocks diffusion (no leaking) -Found in the urinary bladder
23 Glandular Epithelium Function- to produce and secrete substances They make up the GLANDS: exocrine glands Secrete: perspiration, oil, milk, saliva, mucus Examples of exocrine glands: salivary, sweat, mammary endocrine glands Secrete: hormones Examples of endocrine glands: pituitary, thyroid, adrenal
24 Tissues often come in layers on the body - superficial cuts on the skin may need to be stitched if they also go through the underlying tissue. This will definitely need stitches!
25 Muscle Tissue Overall Characteristics: produce motion, maintains posture, generates heat, and provides protection
26 Cardiac Muscle -forms the bulk of the wall of the heart. General Characteristics: -striated (alternating light and dark protein bands) -involuntary (Naturally happens) -can regenerate under certain conditions Cool info: in resting conditions, cardiac muscle tissue contracts and relaxes an avg of 75 times a minute.
27 Skeletal muscle- attached to the bones of the skeleton General Characteristics: -striated (alternating light and dark protein bands) -voluntary(we can conciously control and move parts of the skeleton) -skeletal muscle tissue is called muscle fibers (surrounded by connective tissues and allow blood vessels and nerves to penetrate)
28 Smooth muscle- located in the walls of hollow internal structures Internal structures such as: Blood vessels Airways to the lungs Stomach Intestines Gallbladder Urinary bladder General Characteristics: -Nonstriated -involuntary
29 Consists of two types of cells: Neurons and Neuroglia Nerve Tissue Neurons= nerve cells -sensitive to various stimuli, convert stimuli into impulses, then send impulses to other neurons, muscle fibers, or glands. Neuroglia= glia; neuron s little maids -smaller than neurons, 5 to 50 times more numerous, hold nervous tissue together, can t conduct impulses, multiply to fill in spaces formerly occupied by neurons. Where do you find it?- brain, spinal cord, the nerves and associated ganglia.
30 Nervous tissue (spinal cord)
31 Connective Tissue (collect all of left over tissue) General Characteristics: -Most abundant tissue in your body, found throughout -2 main components: cells and extracellular matrix (which is composed of protein fibers and ground substance- fluid, semi-solid) -Binds structures together -Provides support, protection, framework, fills space, stores fat, produces blood cells, fights infection, and helps repair tissue. -Most has a good blood supply (except cartilidge and tendons) -Cells can reproduce
32 Connective Tissue in 4 classes: Classes: Blood, Bone, Cartilage, and Connective Tissue Proper Then put into two categories: -whether the cells secrete or maintains the extracellular matrix Include: Fibroblasts, hemocytoblasts, chondroblasts, and osteoblasts -or- -whether they are accessory cells and are supported by the connective tissue Include: fat storing cells, white blood cells, mast cells, macrophages, antibody-producing plasma cells Then the 4 classes can be subdivided:
33 Class 1: Connective Tissue Proper Two categories- loose and dense If loose- then this tissue generally serves as packing material (3 types) --Binds underlying organs to skin and to each other --Forms delicate thin membranes throughout the body If dense- then this tissue is found in tendons and ligaments. (3 types)
34 Class 1: Connective Tissue Proper- Loose (3 types) Aerolar- fibers loosely woven; most widely distributed; soft and pliable, contains many accessory cells- serves as packaging material Adipose- aerolar tissue that is invaded by fat cells Reticular- loosely woven fibers; forms framework that supports blood cells in lymph nodes, spleen, and bone marrow.
35 Class 1: Connective Tissue Proper- Dense(3 types) Regular- mostly made of collagen fibers; slightly wavy; found in places where tension is exerted in a single direction--tendons, where muscles attach to bones, and ligaments Irregular- made of things same as regular, move in multiple directionsskin, digestive tract, heart valves Elastic- stretched easily and then recoils back quickly- found in vocal cords, some ligaments- especially penis, walls of arteries, and lung tissue
36 Class 2: Cartilage (3 types) Cartilage- tough but flexible, cells are called chondrocytes, has no blood vessels or nerves 3 types: Hyaline cartilage- Fibrocartilage- Elastic cartilage-
37 Hyaline Cartilage Covers ends of joints, nose and respiratory passages
38 Fibrocartilage Tough, shock absorbing
39 Elastic cartilage External Ear and Larynx
40 Bone Tissue (Osseus)
41 Class 3: Bone (2 types) Bone- one of the hardest tissues in body; resists compression; numerous collagen fibers, cells are called osteocytes 2 types: Compact Bone- form external layer of all bones and bulk of long bones (helps resist stress of weight) Spongy Bone-form short, flat, and irregularly shaped bones and most of heads of long bones
42 Class 4: Blood Has 3 functions Transportation- to delivers oxygen, nutrients, carbon dioxide, nitrogen waste, hormones Regulation- body temp and ph in body tissues Protection- prevent blood loss by forming blood clots; antibodies, and WBCs fight infection
43 Blood Tissue
44
45
46 5 Types of Cells in Connective Tissue Cells Mast cells (alongside blood vessels and prevents clots) Macrophages (engulf bacteria and cellular debris through endocytosis) Fibroblasts (most numerous; produce fibers) Collagenous (bones, ligaments, tendons) Elastic (respiratory)
47 5 Types of Cells in Connective Tissue Cells (cont.) Plasma cells (develop from white blood cells; secrete antibodies) Adipocytes (fat cells or adipose cells)
48
49
50 Main types of Fibers Collagenous fibers - strong and flexible bones, tendons and ligaments Elastic fibers - very flexible, ears and vocal cords
51 Categories of Connective Tissue
52 Loose Connective Tissue or Areolar Tissue Binds underlying organs to skin and to each other Forms delicate thin membranes throughout the body
53 Fibrous Connective Tissue Tendons = muscles to bones Ligaments = bones to bones
54 DENSE CONNECTIVE TISSUE CARTILAGE Cartilage cells are called chondrocytes Provides support and attachments, also cushions bones
55 Hyaline cartilage
56 Hyaline cartilage
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